Shuttle tension



June30,1936. H -A DAVI 2,046,288

SHUTTLE TENS ION Filed Jan. 24, 1936 INVENTOR.

ATTORNEY.

Patented June 30, 1936 UNITED STATES ro azss SHUTTLE TENSI ON" Harry A. Davis, Hopedale, Mass, assignor to Draper Corporation, Hopedale, Mass, a. corporation of Maine Application January 24, 1936, Serial No. 60,656

3 Claims.

The present invention pertains to loom shuttles, and more particularly to. such shuttles having tension devices of the spring clamp type.

VI'ension devices of the type mentioned are provided with an adjusting screw by which the pressure of the spring on the friction member or members may be regulated. In prior devices, a tight fit of the adjusting screw in the opening into which it is threaded, constituted the only means for preventing accidental rotation of the screw during operation of the shuttle in a loom. Such prior means has proven unsatisfactory because the screws wear and become loose after a few adjustments.

The object of the present invention is to provide, in a shuttle of the type mentioned, a practical form of releasable means for positively locking the adjusting screw against rotation.

In the specific embodiment of the invention herein disclosed, an automatically threading loom shuttle is provided with a pair of horizontal friction members, the upper one of which is pressed downwardly by a spring. The spring and adjusting screw are contained in a vertical bore in the threading block and the screw is slotted at its upper end. Locking of the screw is accomplished by a locking wire which is releasably held in the slot in the screw head by a spring-pressed plunger contained in a second bore, both the looking wire and screw slot being exposed, and therefore accessible, on an exterior surface of the threading block.

The said embodiment, which is at present preferred, is illustrated on the accompanying drawing, of which:

Fig. 1 is a plan view of the thread delivery end of a shuttle constituting said preferred embodiment;

Fig. 2 is a view of the threading block detached from the shuttle and sectioned approximately on line 22 of Fig. 1;

Fig. 3 is a similar view, but taken approximately on line 33 of Fig. 1; and

Fig. 4 is a view in elevation of the threading block.

The shuttle shown on the drawing comprises a body l having a cavity 2 wherein is received a filling carrier 3, and a threading block 4. The shuttle and threading block are provided with a thread passage 5 through which the filling thread passes before emerging from the side delivery eye 6.

The shuttle is provided with a tension device of the spring clamp type, the tension device being comprised of a lower friction member 1 and an upper friction member 8 which are positioned horizontally within the thread passage 5. The opposed friction members are movably mounted on a pin 9 in the threading block. A coiled spring l8 acts to yieldingly press the upper friction 5 member toward the lower member.

The tension device shown is adjustable, as is usual, the adjustment being provided by an adjusting screw which serves to vary the tension of the spring H3. The adjusting screw l I is mounted 10 in a novel manner, it being threaded into the vertical bore 52, which contains the spring H) with its upper end exposed exteriorly of the'threading block as clearly shown on the drawing. The

upper end of the screw is slotted for reception of 5 a screw driver or other tool. Thus, the screw is readily accessible at all times.

I have provided a locking wire l3 which engages in the slot in the adjusting screw and positively locks the latter against rotation. The 20 looking wire conveniently consists of a laterally extending end portion of a plunger M, the end portion being exposed exteriorly of the threading block. The plunger is mounted in a bore l5 which is parallel to the bore l2. Pref- 25 V erably the bore I5 is formed in a tubular member it which is fixed in the threading block. A coiled spring I! bears at its upper end against a shoulder in the member I6 and at its lower end against the head of the plunger. The spring and 30 plunger serve to releasably hold the locking wire in the slot of the adjusting screw.

The locking wire i3 may be manually lifted out of the slot in the adjusting screw, and the locking wire and plunger turned slightly, whenever it is desired to adjust the tension of the tension device. However, it is impossible for the locking wire to become accidentally released during weaving operations, the adjusting screw being always looked in adjusted position.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. A loom shuttle having a threading block provided with a pair of parallel bores, a friction member carried by said threading block, a spring positioned in one of said bores and acting on said member, an adjusting screw threaded into the bore containing said spring for adjusting the tension of the latter, a plunger in the other of said bores, said plunger having a locking portion engageable with said screw for locking the latter against rotation, and a spring in the last said bore engaging said plunger and thereby releasably holding said locking member in looking engagement with said screw. 7

allel bores, a spring clamp tension device in said thread passage, an adjusting screw'threaded' into one of said bores for adjusting the tension of said device',-said screw having a'slotted'head which is exposed'exteriorly of said threading block, a locking wire, and spring means in the other of said I r l V I a spring housed'within the last said bore and actbo'res releasably holding said wire in said slot to thereby prevent rotation of said screw.

' 3. A loom shuttle having a threading block provided with'a thread passage and a pair. of parallel vertical bores, a spring clamp tension'device'having op osed friction members'positioned horizontally in said thread passage, an adjusting screw threaded into one of said'bo'res for adjust- 1 ing the tension of said device, said screw having a slotted head which is exposed exteriorly of said threading block, a plunger extending within the otherof said bores, said plunger having a laterally extending exposed end portion, and a ing on said plunger to releasably'hold said'er'id 10" portion in the slot in said adjusting screw.

HARRY A. DAVIS. 

